[css-text-4] Loosen requirement about balancing not affecting the line count w3c#10186

Author: fantasai

css-text-4/Overview.bs

@@ -5530,10 +5530,15 @@ Selecting How to Wrap: the 'text-wrap-style' property</h3>
 			Line breaks are chosen to balance
 			the remaining (empty) space in each line box,
 			if better balance than ''text-wrap-style/auto'' is possible.
-			This must not change the number of line boxes
+			This should avoid changing--
+			and in the case of 5 or fewer lines must not change--
+			the number of line boxes
 			the block would contain
 			if 'text-wrap' were set to ''text-wrap-style/auto''.
 
+			Note: The height of the line boxes may nevertheless change,
+			due to changes in which content appears together on one line.
+
 			<wpt>
 				white-space/text-wrap-balance-001.html
 				white-space/text-wrap-balance-002.html
@@ -13115,6 +13120,9 @@ Changes</h2>
 	Significant changes since the <a href="https://www.w3.org/TR/2024/WD-css-text-4-20240219/">19 February 2024 Working Draft</a> include:
 	* Renamed the 'text-spacing-trim' value <css>trim-auto</css> to ''trim-both''.
 		(<a href="https://github.com/w3c/csswg-drafts/issues/10161">Issue 10161</a>)
+	* Loosened requirement about not changing lines for ''text-wrap-style: balance''
+		for cases with large numbers of lines.
+		(<a href="https://github.com/w3c/csswg-drafts/issues/10186">Issue 10186</a>)
 
 	Significant changes since the <a href="https://www.w3.org/TR/2023/WD-css-text-4-20231020/">20 October 2023 Working Draft</a> include:
 	* Restored accidentally deleted “and each line after a [=forced line break=]”